LOSI Promoto-MX Motorcycle Aluminum Rear Brake Disc by JAZRIDER JR-LMX07-DB  [JR-LMX07-DB]

Aluminum Rear Brake Disc for Promoto-MX

This aluminum rear brake disc is an RC-scale replacement part designed specifically for the Promoto-MX motorcycle chassis and supplied by JAZRIDER under model JR-LMX07-DB. It is intended to serve as a durable rotor option for scale dirt bike builds where a metal disc is preferred over stock plastic components.

Fit and compatibility: this part is made for the Promoto-MX motorcycle model family. Before installation, verify the rotor seats flush on the hub and that the mounting holes line up with the bike's rear hub flanges. Do not attempt to force fit to other chassis unless the mounting pattern is confirmed identical.

Installation notes: use the original mounting hardware where possible and tighten fasteners progressively to maintain concentric alignment. Check rotor runout by spinning the rear wheel on a stand and make small adjustments to hub position as needed. Avoid overtightening to prevent thread damage.

Tuning role: swapping to an aluminum disc changes thermal mass and stiffness compared with plastic rotors, which can alter braking feel on scale runs. Use this disc in combination with compatible brake pads and test braking performance at low speed before full use. This product is intended for remote-controlled models only and not for real vehicles.